Vésteinn Hafsteinsson (born 12 December 1960) is a retired discus thrower from Iceland.
He was born in Selfoss, and represented his native country at four consecutive Summer Olympics, starting in 1984.
Vésteinn competed in five consecutive World Championships, starting in 1983, but never reached the final.
He previously coached World and Olympic champion Gerd Kanter, Olympic silver medalist Joachim B. Olsen, as well Daniel Ståhl and Simon Pettersson, the gold and silver medalists, respectively, at the Tokyo Olympics.
This biographical article relating to Icelandic athletics and track and field is a stub.